CN101663526A - Can prevent the high differential pressure control valve that cavitates - Google Patents
Can prevent the high differential pressure control valve that cavitates Download PDFInfo
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- CN101663526A CN101663526A CN200780052487A CN200780052487A CN101663526A CN 101663526 A CN101663526 A CN 101663526A CN 200780052487 A CN200780052487 A CN 200780052487A CN 200780052487 A CN200780052487 A CN 200780052487A CN 101663526 A CN101663526 A CN 101663526A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
- F16K27/0218—Butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
A kind of high differential pressure control valve of cavitating of can preventing, also has cavitation erosion inhibition ability even make the valve body monomer, and at control flow rate and pressure accurately under the valve opening of the wide range of the low paramount aperture of aperture, can be according to the valve body shape of the Flow characteristics of use selector valve under middle aperture, and, by described cavitation erosion being prevented body and the valve body with this valve body shape from making up, under simple in structure and small-sized situation, can prevent cavitation erosion more to heavens, even under the condition of High Pressure Difference and high flow rate, also can bring into play the controlled of height.Valve of the present invention has the valve body that valve body that is approximate tubular and the inside that is provided in this valve body can make this inside open and close, be characterised in that, back to back position, downstream under the full-gear of this valve body is equipped with and is used to prevent that the cavitation erosion of cavitating from preventing body, this cavitation erosion prevent body set into, prevent that in this cavitation erosion a plurality of porous slab equal intervals ground of body is formed with the hole of a plurality of prescribed depth, described a plurality of porous slab proper spacing of being separated by mutually, and be roughly parallel to the flow direction of the fluid that in this valve body, flows down, can prevent the generation of cavitating.
Description
Technical field
The cavitation erosion breaker (cavitation breaker) that is used to prevent cavitation erosion (cavitation) that the present invention relates on the path of the pipe arrangement of fluid flow, set, be particularly related to the cavitation erosion breaker by having the cavitation erosion inhibition and having flow control under High Pressure Difference and high flow rate and the eccentric-butterfly-valve of pressure control and the back to back locational cavitation erosion with preventing property of cavitation erosion in downstream that is configured in this eccentric-butterfly-valve prevent that body from constituting can prevent the high differential pressure control valve that cavitates.
Background technique
For being provided in common valve on the path that is used to make the pipe arrangement that fluid flows, be used under the situation of liquid phase fluid, when the pressure reduction in the upstream side of this valve and downstream side became big, the pressure of the back to back position, downstream side of valve reduced, be easy to be low to moderate below the saturation vapor pressure, be easy to thus cavitate.Cavitate in the downstream area of the pressure reduction point that is called as contracted flow face (vena contracta) below becoming saturation vapor pressure, produce cavitation bubbles, and break and produce percussive pressure in this cavitation bubbles of downstream area of valve, thereby produce noise and vibration, and often valve body internal surface or pipe arrangement are caused damage.The valve that particularly is provided on the path of pipe arrangement is under the situation of butterfly valve or ball valve, because the pressure recovery when using these valves is big etc., thereby cavitation phenomenon as described above is more obvious.
The valve that is provided on the path of pipe arrangement has all kinds, as the control valve of generally flow and pressure being controlled, by mobile the apply resistance of valve to the fluid that flows down, can control the pressure in its flow and downstream side.When the valve, produce contracted flow portion at fluid, become in the position of valve and then and shrink maximum contracted flow, thereby the flow velocity in this zone accelerates, and the pressure in should the zone reduces in valve portion.And, for example under the situation of using butterfly valve, near the face in valve body downstream side, produce eddy current, also produce low voltage section in the whirlpool inside of eddy current, thereby form the situation that is easy to cavitate.In addition, the upstream side of valve and the pressure reduction in downstream side are big more, i.e. the upstream side of valve and downstream side High Pressure Difference, and the pressure reduction amount that pressure reduces point is big more, thereby is difficult to the generation and the control flow rate characteristic that suppress to cavitate more.
Knownly have about cavitating, even pressure reduction is identical, because the difference of valve kind or valve arrangement, the pressure reduction amount at contracted flow face place is also different, and the valve of pressure recovery difficulty is difficult for cavitating.Pressure recovery is to stipulate big more difficult more cavitation erosion of this value by the intrinsic value of the valve that is called as pressure-recovery factor.For example, for this value, the pressure-recovery factor of stop valve (globe valve) is about 0.8, and the pressure-recovery factor of butterfly valve is about 0.65, and the pressure-recovery factor of ball valve is about 0.55, compares with ball valve with butterfly valve, and stop valve is difficult for cavitating.
Therefore, in the past for the means that often adopt that suppress to cavitate are the big valve classes of selection pressure restitution coefficient value, and then in this valve class, also select the big valve of pressure-recovery factor value of design in order to obtain better controlled.In addition, can enumerate for example technology of the disclosed patent documentation 1 of the applicant in the means that are used for suppressing to cavitate.The technology of patent documentation 1 is provided with a plurality of broach by the assigned position in the valve body surface of centre type butterfly valve, makes fluid become thin jet flow, thereby the cavitation erosion in the downstream side that occurs in valve body is disperseed, and suppresses the growth of cavitation erosion.
In addition, as suppressing the means that cavitation erosion takes place, as patent documentation 2 is disclosed, ball valve and porous slab are set simultaneously, on the basis of the pressure loss that produces by ball valve, add the pressure loss that produces by porous slab, thereby the pressure loss is disperseed, suppress cavitation erosion thus.For the valve of patent documentation 2, in the inside of ball valve, in the upstream side of valve body and these both sides, downstream side or wherein the either side setting runs through and is provided with a plurality of fluid cushion portions that can make the hole that fluid flows through, and has gasproof erosion characteristic thus.
On the other hand, the effect of control valve is a control flow rate, and the Flow characteristics that valve is intrinsic is depended in its flow control.Has inherent flow characteristic as the means that embody Flow characteristics, the flow of the relative valve opening when this inherent flow characteristic represents that with % pressure reduction before and after the valve is constant, as control characteristic representative be to embody the Cv linear performance of opening (quick open) characteristic, Cv value and valve opening variation in direct ratio soon of big changes in flow rate or flow % becomes the logarithm relationship change with valve opening % equal percentage (equal percentage) characteristic etc. in little valve opening scope, because of the difference difference of the structure of valve big.For example, the inherent characteristic of common centre type butterfly valve is to show below 60 ° that in valve opening the inherent characteristic of equal percentage characteristics, eccentric-butterfly-valve is that flow is temporary transient when being embodied in opening of valves and becomes many fast katals and the scope that can control narrows down, and therefore need select valve with suitable characteristic according to use.Inherent flow characteristic is the characteristic under the constant situation of pressure reduction before and after the valve, but on the pipe arrangement line of reality, according to the ejection pressure of centrifugal pump and the relation and the secondary pipe arrangement situation of flow, the pressure and the flow of valve front and back change.The characteristic of the flow of the relative actual valve aperture of this expression is called the actual flow characteristic.Wherein, under the situation of the representing characteristic of considering valve, often use the characteristic of centrifugal pump to represent representative actual flow characteristic (the following actual flow characteristic that only is called).
The Cv linear performance is under the constant condition of the valve pressure reduction that makes valve, flows through the character that the flow % of the fluid of this valve is directly proportional with valve opening %, property linearly under the situation of inherent flow characteristic, the curve of convex on becoming under the situation of actual flow characteristic.When considering the flow % of relative valve opening %, changes in flow rate is big in the little scope of valve opening, and the stable and controlled raising of changes in flow rate in the big scope of valve opening.Thus, the good valve of Cv linear performance is suitable for the main valve as the constant bulk container of for example water level as reservoir and wet pit under the situation of the real linearity of needs.In addition, be suitable for the situation of pipe arrangement resistance less than the resistance of valve.
Relative with it, this inherent flow characteristic of equal percentage characteristics is the changes in flow rate of the unit change amount of relative valve opening becomes logarithmic relationship with flow a characteristic, is the curve of convex down, but becomes approximate direct proportaion under the situation of actual flow characteristic.Under widely used situation, valve controlled relatively good, existing reed valve demonstrates the Flow characteristics near equal percentage characteristics mostly.The valve that equal percentage characteristics is good is widely used usually, is applicable under the situation that pressure oscillation is big in the piping system, is applicable to that the pressure reduction between maximum, minimum flow changes in the situation more than 3: 1.
Patent documentation 1:JP spy opens clear 57-157866 communique;
Patent documentation 2:JP speciallys permit clear 61-256082 communique.
Summary of the invention
The problem that invention will solve
There is following problem in the butterfly valve with cavitation erosion muting function of patent documentation 1, promptly, in the little scope of valve opening, a plurality of broach that fluid is formed on the valve body surface are separated into thin jet flow, thereby can suppress cavitation erosion, but in the big scope of valve opening, because the effect of broach reduces cavitation erosion muting function deficiency under the condition that forms High Pressure Difference and high flow rate.
In addition, in the valve with fluid cushion portion of patent documentation 2, its cavitation erosion inhibition ability depends on the ability of fluid cushion portion.But, even exist the fluid cushion portion of porous slab or throttle orifice etc. to be set to multilayer, under High Pressure Difference, can not obtain the problem that enough cavitation erosion suppresses effect, if be set to also can to produce under the situation of very many multilayers the size of the portion of the setting very large accessory problem that becomes in fluid cushion portion.And, also exist to obtain the problem that the range of flow as the good control characteristic of valve narrows down.That is to say, according to above-mentioned explanation, do not exist under the High Pressure Difference control flow rate and pressure accurately in the past, and can prevent the control valve of cavitation erosion.
In addition, it is relatively good that existing centre type butterfly valve exists in the interior equal percentage characteristics of the scope of valve opening below 60 °, and under the situation of high aperture the problem of controlled difference, eccentric-butterfly-valve exists in the problem of the controlled difference of valve opening scope of low aperture, thereby there are not butterfly valve that demonstrates the good Flow characteristics of Cv linear performance and the controlled butterfly valve that obtains wide range.
The present invention makes in view of the above problems, its purpose is to provide the cavitation erosion of a kind of small-sized (compact) to suppress body, which type of no matter in valve body, just can suppress to cavitate by described small-sized cavitation erosion being suppressed the back to back position, downstream that body is provided in valve body.
And then, the invention provides a kind of high differential pressure control valve of cavitating of can preventing, about being provided in the back to back locational valve body in upstream that cavitation erosion prevents body, utilize fluid analysis, valve body in suitable structure is under the state of suitable valve opening, analysis is at the negative pressure region of the downstream area generation of this valve body, size by negative pressure region is judged the trend that causes cavitation erosion, derivation has highly controlled valve body structure, thus, also has cavitation erosion inhibition ability even make the valve body monomer, and at control flow rate and pressure accurately under the valve opening of the wide range of the low paramount aperture of aperture, can be according to the valve body shape of the Flow characteristics of use selector valve under middle aperture, and by described cavitation erosion being prevented body and the valve body with this valve body shape from making up, under simple in structure and small-sized situation, can prevent cavitation erosion more to heavens, even under the condition of High Pressure Difference and high flow rate, also can bring into play the controlled of height.
The means that are used to deal with problems
In order to address the above problem, as the means that adopted in the high differential pressure control valve that can prevent to cavitate of the present invention, this valve has on the path that is provided in the pipe arrangement that makes fluid flow and at upstream side with the downstream side all is the valve body of approximate tubular and at the valve body of the inside of this valve body can the mode that this inside opens and closes being disposed, it is characterized in that, back to back position, downstream under the full-gear of this valve body is equipped with and is used to prevent that the cavitation erosion of cavitating from preventing body, this cavitation erosion prevents that body is provided on the back to back position, downstream of described valve body, and, prevent that in this cavitation erosion a plurality of porous slab equal intervals ground of body is formed with the hole of a plurality of prescribed depth, there is proper spacing mutually in described a plurality of porous slab, and be roughly parallel to the flow direction of the fluid that in this valve body, flows down, when described fluid passes through between described porous slab, be formed on and flow down the resistance that each hole on the vertical direction of direction becomes the eddy current that this fluid produces with described fluid on each porous slab, the kinetic energy of this eddy current is converted to heat energy, this fluid steadily and is equably reduced pressure, thereby can prevent to take place in low differential pressure to High Pressure Difference therapeutic method to keep the adverse qi flowing downward erosion.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, when the nominal diameter with pipe arrangement is made as D, cavitation erosion prevents that body from setting position into the downstream of being positioned at of, this valve body under the valve body full-gear and preventing that to this cavitation erosion the interval of upstream-side-end of body is in 1D.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, when the aperture that will be arranged on each hole on the porous slab is made as d, be arranged on a spacing to each other of the hole on the porous slab below the above 4d of 1.5d.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, when the aperture that will be arranged on each hole on the porous slab was made as d, porous slab flowed down length on the direction below the above 100d of 20d fluid.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, when the aperture that will be arranged on each hole on the porous slab was made as d, to each other each of porous slab was at interval below the above 3d of 1d.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, be formed on the more than one hole in a plurality of holes on the more than one porous slab in a plurality of porous slabs, form separately with the concavity of prescribed depth from the recessed suitable shape of the plate face on the surface of this porous slab and two sides, the back side.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, be formed on the more than one hole in a plurality of holes on the more than one porous slab in a plurality of porous slabs, form the surface and the back side that connect this porous slab.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, the more than one porous slab in a plurality of porous slabs has the curved part more than a place of the direction bending of approximate vertical.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, the valve with valve body and valve body constitutes, and can releasably set cavitation erosion in back to back position, the downstream of this valve body and prevent body.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, valve has the valve body of approximate tubular, valve body and valve shaft, described valve body portion within it has valve seat, described valve body can be supported on the inside of this valve body rotatably by axle, by with this inner valve seat butt or separate and can the inside of this valve body be opened and closed, described valve shaft is the running shaft of this valve body, can be supported on this valve body by axle rotatably, described valve body is an eccentric-butterfly-valve, the valve body shaft sleeve part that is used to insert described valve shaft with the downstream side that is formed on this valve body, described valve seat is arranged on the position with respect to the flow direction off-centre of valve shaft mind-set fluid, identical with it, valve body and valve seat also is positioned on the position with respect to valve shaft center off-centre, and when full cut-off, fall to being arranged in described valve seat, being centered close to of valve shaft to flowing down the vertical direction of direction with fluid and fluid flows down on the dual eccentric position of the downstream side off-centre on the direction.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, the edge part periphery of the nozzle side of valve body on the face of this valve body upstream side and the edge part periphery of throttle orifice side are formed with upstream the upstream nozzle side lug boss and the upstream throttle orifice side lug boss of side projection Chengqiu shape respectively, and, the face in this valve body downstream side is that the center has with respect to the sealing surface of valve seat and the valve body and valve seat butt inclination to 5 °～20 ° of clockwise directions with the valve shaft, and have the downstream throttle orifice side lug boss that forms in the mode of side projection Chengqiu shape downstream at the edge part periphery of the throttle orifice side of the face in downstream side, the Cv linear performance is good.
Can prevent that the high differential pressure control valve that cavitates is characterised in that, the edge part periphery of the nozzle side of valve body on the face of this valve body upstream side is formed with upstream, and side compares the upstream nozzle side lug boss that raises into the mound shape significantly, and, the face in this valve body downstream side is that the center has with respect to the sealing surface of valve seat and the valve body and valve seat butt inclination to 5 °～20 ° of clockwise directions with the valve shaft, and the edge part of the throttle orifice side of this valve body outwards protrudes diametrically than the edge part of nozzle side, and equal percentage characteristics is good.
The effect of invention
The present invention has following effect, promptly, cavitation erosion is prevented that body is provided on the stream, prevent that in this cavitation erosion a plurality of porous slab equal intervals ground of body is formed with the hole of a plurality of prescribed depth, described a plurality of porous slab suitable interval that is separated by mutually, and be roughly parallel to the flow direction of the fluid that flows down, by such structure, thereby when this fluid passes through between this porous slab, being formed on each hole on the direction vertical with flowing down direction on each porous slab becomes the eddy resistance of this fluid, make the kinetic energy of this eddy current be converted to heat energy, can make this fluid steadily and equably reduce pressure not only miniaturization, cost is low, and can be arranged on the existing valve, only be provided on the back to back position, downstream of valve body, just can prevent the generation of cavitating to the High Pressure Difference in low differential pressure.
In addition, the high differential pressure control valve that cavitates that can prevent of the present invention sets valve body of the present invention at upstream side, set cavitation erosion of the present invention in back to back position, the downstream of this valve body and prevent body, its effect is, for being provided in the valve body that this cavitation erosion prevents the back to back position, upstream of body, utilize fluid analysis, under the valve body of suitable structure state in suitable valve opening, analyze the negative pressure region of the downstream area generation of this valve body, size by negative pressure region is judged the trend that causes cavitation erosion, has highly controlled valve body structure and derive, thus, also has cavitation erosion inhibition ability even make the valve body monomer, and at control flow rate and pressure accurately under the valve opening of the wide range of the low paramount aperture of aperture, can be according to the valve body shape of the Flow characteristics of use selector valve under middle aperture, and by described cavitation erosion being prevented body and the valve body with this valve body shape from making up, under simple in structure and small-sized situation, can prevent cavitation erosion more to heavens, even under the condition of High Pressure Difference and high flow rate, also can bring into play the controlled of height.
Embodiment
Below, describe embodiments of the present invention in detail.Of the present inventionly can prevent that the high pressure difference limen that cavitates from being butterfly valve, it is provided in the path of the pipe arrangement that is used to make fluid flow, and has a structure that cavitates that prevents that under High Pressure Difference and high flow rate, also can prevent to cavitate and can bring into play flow control and pressure control, it is characterized in that, be provided with valve body in the inside of valve body together and be used to prevent that the cavitation erosion of cavitating from preventing body.In addition, the structure of the butterfly valve here limits especially, preferred controlled good valve body or the valve body with inhibition cavitation erosion ability.
It is cylindric that valve body is, and is formed with the stream that fluid is flow through in inside.Upstream side position in this valve body inside has valve body, and this valve body is supported by stem shaft and can rotate, and can the inside of this valve body be opened and closed.Back to back position, downstream under the full-gear of valve body is equipped with and is used to prevent that the cavitation erosion of cavitating from preventing body.
Cavitation erosion prevents that body is provided on the back to back position, downstream of valve body, cavitation erosion prevents that a plurality of porous slabs of body have suitable interval mutually, and be roughly parallel to the flow direction of the fluid that in this valve body, flows down, on described porous slab with the hole of a plurality of prescribed depth of equidistant formation, preferably when the aperture that will be arranged on each hole on the porous slab was made as d, spacing was below the above 4d of 1.5d.Preferably when 0 aperture that is arranged on each hole on the porous slab was made as d, to each other each of porous slab was at interval below the above 3d of 1d.In addition, at this moment, be below the above 100d of 20d at the length setting that fluid flows down on the direction preferably with porous slab.
In addition, be formed on the surface and the back side that hole on a plurality of porous slabs can connect this porous slab, perhaps can be with recessed formation of plate face of proper depth from this porous slab.And porous slab needn't be a planar, and for example, the suitable position of porous slab can be to the direction bending of approximate vertical.
The cavitation erosion that constitutes like that more than preferred with porous slab prevent body set into, when the nominal diameter with pipe arrangement is made as D, the interval of upstream-side-end that prevents body from the position in the downstream of being positioned at of this valve body under the valve body full-gear to this cavitation erosion prevents that then effect that cavitates and the effect that reduces noise from reducing if surpass this scope in 1D.In addition, the valve with valve body and valve body constitutes and can releasably set cavitation erosion in back to back position, the downstream of this valve body and prevent body, in this case, not only is easy to safeguard, and can only changes cavitation erosion and prevent body.
As described above, have the cavitation erosion prevent that the cavitation erosion of body from preventing in the discrepancy in elevation positive control valve, when this fluid passes through between porous slab, being formed on each hole on the direction vertical with flowing down direction on each porous slab becomes the eddy resistance of this fluid, make the kinetic energy of this eddy current be converted to heat energy, steadily and the equably decompression of this fluid can be made, the generation of cavitating can be prevented in low differential pressure to the High Pressure Difference.
First embodiment
Below, with reference to accompanying drawing embodiments of the invention are described in detail.Present embodiment can prevent that the high differential pressure control valve (1) that cavitates from being eccentric-butterfly-valve, it is provided in the path of the pipe arrangement that is used to make fluid (F) circulation, and have and under High Pressure Difference and high flow rate, also can prevent to cavitate and can bring into play the structure that cavitates that prevents of high flow control and pressure control, it is characterized in that, be provided with valve body (3) in the inside of valve body (2) together and be used to prevent that the cavitation erosion of cavitating from preventing body (4) with inhibition cavitation erosion ability.
As shown in Figure 1, can prevent that the high differential pressure control valve (1) that cavitates has: valve body (2) is the approximate circle tubular; Valve body (3) is configured in the upstream side position, inside of this valve body (2), and is inserted into valve rod (5) axle in the valve body shaft sleeve part (301) and supports and can rotate, and opens and closes with the inside to this valve body (2); Cavitation erosion prevents body (4), is provided on the back to back position, the hands-off downstream of switching track with this valve body (3), is used to prevent cavitation erosion.
With reference to Fig. 1 and Fig. 3, valve body (2) connects the stream that is provided with drum, the seal ring (203) that is formed by elaxtic seals such as rubber removably is installed on the upstream side opening portion of valve body (2), and be formed with valve seat (205), the actual diameter of its regulation stream (204) can seal stream (204) under the valve body and valve seat (302) of valve body (3) periphery is connected to situation on the described valve seat (205).The seal ring fixed body (206) of seal ring (203) by in the form of a ring releasably is fixed on the opening portion of stream upstream side of valve body (2).In addition, because present embodiment can prevent that the high differential pressure control valve (1) that cavitates from being purpose with control flow rate and pressure, so preferred valve seat (205) diameter is set less than the pipe arrangement nominal diameter, the size of valve seat (205) diameter is about 80% the bests of pipe arrangement nominal diameter.
Valve body (2) extends to foreign side on diametric(al) from the upstream side outer circumferential face stem shaft supporting portion (213), (215).Be formed with in the upper end in the outside, the radius side of a stem shaft supporting portion (213) board (208) is installed, this installation board (208) has the axial plane perpendicular to valve rod (5), is used to install the actuator of actuate valve stem (5) etc.
For valve body (2) inside, the approximate centre position of internal diameter from the back position of the nozzle side of the valve body (3) that is in full close position to valve rod (5) enlarges towards the downstream side, thereby expanding, opens stream (204), and from the approximate centre position of this valve rod (5) to the downstream position apart from the about valve body in approximate centre position (3) the radius left and right sides length of this valve rod (5), internal diameter constant.And, the stream (204) that valve body (2) is inner, from downstream position apart from the about valve body in approximate centre position (3) the radius left and right sides length of this valve rod (5), to apart from the distance of this valve rod (5) central position and the suitable downstream position of distance from center to the outer periphery of valve body (3) of valve rod (5), internal diameter gently dwindles and stream (204) is narrowed down.And, in valve body (2) inside, from apart from the distance of this valve rod (5) central position and end of downstream side from the center of valve rod (5) to the suitable downstream position of the distance of the outer periphery of valve body (3) to valve body (2), internal diameter is constant, is formed for releasably installing cavitation erosion and prevents that the cavitation erosion of body (4) from preventing body installing space (210).In addition, valve body (2) inner be in the back to back position, downstream of the valve body (3) of the throttle orifice side full close position under at valve body (3), be formed with to radial direction is inboard and protrude the counter-rotating that is provided with and prevent portion (211), reverse to prevent valve body (3).
Cavitation erosion in being formed on the inner zone, downstream side of valve body (2) prevents in the body installing space (210), be inserted with profile from the downstream side of valve body (2) and be the internal diameter cavitation erosion about equally that approximate circle tubular and external diameter and this cavitation erosion prevent body installing space (210) and prevent body (4), utilize fixing screw (212) this cavitation erosion to be prevented that body (4) is fixed on the valve body (2) from the downstream side end face of valve body (2).
With reference to Fig. 1,4～6, cavitation erosion prevents that body (4) from comprising: cylindrical shape framework (401), have prevent body installing space (210) with cavitation erosion internal diameter about equally external diameter and be the cylindric of specific length; A plurality of porous slabs (402) are provided in the inside of this cylindrical shape framework (401) parallel to each other.Porous slab (402) is that the metal perforated plate (punchingplate) that will be penetrated with a plurality of holes (403) on plate face direction suitably bends to constituting to the stepped of short transverse lifting.
The perforated plate that constitutes each porous slab (402) be have suitable size for example thickness be that 1.5mm, width are on 84mm and the length proper metal plate, in the vertical with the 5mm spacing, stagger 60 ° and to form a plurality of diameters with 5mm spacing perforation be that the through hole (403) of 3mm forms mutually in the horizontal.The stepped part that the suitable bending of each porous slab (402) forms is perforated plate to be bent to make the spacing of short transverse part be 30mm, and the spacing of substantially horizontal part is that 5mm forms.In addition, when preferably being made as d in the aperture that will run through the hole (403) that is arranged on the perforated plate, porous slab (402) is below the above 100d of 20d at the length setting that flows down on the direction of fluid (F).In addition, at this moment, preferred hole (403) spacing to each other is about 1.5d～4d, can porous slab (402) interval to each other be set at appropriate value according to the desired value of control, but be preferably set to d～3d, if exceed the then control characteristic reduction of this scope.
Form stair-stepping each porous slab (402) like this on the diametric(al) of the level of cylindrical shape framework (401) when overlapping in parallel to each other, the shape of these porous slabs (402) on above-below direction forms consistent with the internal diameter of this cylindrical shape framework (401).Cavitation erosion prevents that body (4) from constituting, with as described above such parallel to each other overlapping and a plurality of porous slabs (402) that constitute are contained in the cylindrical shape framework (401), the flow direction almost parallel of each porous slab (402) and the fluid (F) that in valve body (2), flows through.
Prevent body (4) for cavitation erosion, prevent that with cavitation erosion the end of body (4) upstream side is located on the back to back position, downstream of the valve body (3) in the position that the valve body (3) of cavitation erosion when preventing body (4) not with standard-sized sheet interfere, the back to back position of end of downstream side of the valve body (3) when preferably being positioned at from standard-sized sheet when the size with the nominal diameter of pipe arrangement is made as D is to the mode apart from the scope of 1D, prevent that to being formed on cavitation erosion in the valve body (2) body installing space (210) from setting, and cavitation erosion is prevented that body (4) is installed in the inside that this cavitation erosion prevents body installing space (210).
Prevent body (4) according to the cavitation erosion that constitutes like that as described above, when the fluid (F) that in valve body (2), flows through when being provided between the porous slab (402) in the cylindrical shape framework (401), being formed on each through hole (403) perpendicular to flowing down direction on each porous slab (402) becomes the resistance of this fluid (F) eddy current, make the kinetic energy of this eddy current be converted to heat energy, undertaken steadily and decompression equably by convection cell (F), thereby can prevent the generation of cavitating in low differential pressure to the High Pressure Difference.
With reference to Fig. 7～11, use the analog result of fluid analysis model to represent to prevent the effect that cavitates of preventing of body (4) generation by the cavitation erosion that as top explanation, constitutes.Cavitation erosion as the fluid analysis model that here uses prevents that body (40) is shown in Fig. 7 and Fig. 8, wherein, Fig. 7 represents to have and runs through the stereoscopic-state in longitudinal section that the cavitation erosion that the porous slab (42) that the hole that a plurality of apertures are d (43) forms is set prevents the central part of body (40), and the cavitation erosion in Fig. 8 presentation graphs 7 prevents the cross section of the suitable position of body (40).Promptly, cavitation erosion for this model prevents body (40), in the cylindrical shape framework (41) of length 30d, has internal diameter quartering on short transverse with cylindrical shape framework (41), 3 level boards (44a) of being separated by suitable interval mutually and forming, (44b), (44c), inner in cylindrical shape framework (41) by these level boards (44a), (44b), (44c) in each sheaf space of Hua Fening, with be parallel to each other and at interval the mode of 1.2d be equipped with a plurality of porous slabs (42), these a plurality of porous slabs (42) are 30d on the direction inwards, be set at suitable height respectively, and run through with the 1.2d spacing and to be provided with the through hole that a plurality of apertures are d (43).
The analysis result that pressure distribution analysis when Fig. 9 shows the inside that prevents body (40) in the cavitation erosion of the fluid (F) that makes appropriate amount with suitable flow velocity and pressure by such setting draws.As shown in Figure 9, can observe reduced pressure zone in the fluid (F) that between each porous slab (42), flows through, but the zone that is formed in each hole (43) in a plurality of holes (43) on each porous slab (42) becomes isobaric zone.
As shown in figure 10, this eddy current of fluid (F) that can confirm to flow through the surface of porous slab (42) and the back side in the hole (43) inner region offset because of interference, perhaps the hole becomes resistance and makes kinetic energy consumption.
In addition, in order to play the effect that reduces fluid (F) pressure reposefully in a plurality of holes (43) of confirming to be formed on the porous slab (42), cavitation erosion is prevented that body (40) and cavitation erosion from suppressing body (46) and simulating comparison, this cavitation erosion suppresses body (46) does not have the cavitation erosion of above-mentioned model to prevent the hole (43) of body (40) fully, makes porous slab (42) only be plate (45).It is the results are shown among Figure 11.(A) among Figure 11 shows the analog result that the cavitation erosion of having adopted imperforate plate (45) suppresses body (46), and (B) among Figure 11 shows and adopted the cavitation erosion of the porous slab (42) that is formed with a plurality of holes (43) to prevent the analog result of body (40).
(A) from Figure 11 and relatively learning (B), cavitation erosion at (A) suppresses in the body (46), cavitation erosion suppresses near the decompression significantly in the on a large scale central part on fluid (F) flow direction of body (46), from here to end of downstream side on a large scale in form reduced pressure zone, produce the zone of strong decompression again in the position of end of downstream side and then.Suppress body (46) with the cavitation erosion of (A) and compare, prevent in the body (40) that in the cavitation erosion of (B) near the narrow zone end of downstream side produces more weak reduced pressure zone, but the degree that reduces pressure diminishes significantly.In addition, in Fig. 9 and 11, the color of fluid is dark more, and expression decompression amplitude is big more.
Learn from above result, when fluid (F) flows through in cavitation erosion prevents body (4), go up in each hole (403) in formed a plurality of holes (403) at be separated by mutually appropriate intervals and the parallel a plurality of porous slabs (402) that set, eddy current is in opposite directions offset because of interference mutually, or make the kinetic energy of whirlpool be converted to heat by the resistance in hole, thereby the fluid (F) that will flow through in cavitation erosion prevents body (4) reduces pressure downstream gradually, suppresses and prevent to cavitate.
In addition, the shape of porous slab (402) can constitute such various forms shown in (A)～(F) among Figure 12.For example, as (A) among Figure 12 or (B), can be at the plate (402a) of predetermined thickness, surface that (402b) equal intervals forms a plurality of run-through boards (402a), (402b) and circular hole (403a), (403b) at the back side.Perhaps, shown in (C) among Figure 12, can distinguish the surface of slave plate (402c), the hole (403c) that back side is provided with depression, in this case, the position that is provided with in hole (403c) can be inconsistent on the surface and the back side, for example, like that, staggered in the hole (403d) that is formed on the surface and the back side, the position of (403f) mutually as (D) or (F).In addition, the shape of hole (403c) is not limited to circular hole, for example, as (D) or (E), shown in (F) like that, can be taper or semi-circular shape.In addition, shown in (B), can form the end difference that the suitable position with plate (402b) forms to the direction bending that flows down direction that is approximately perpendicular to fluid (F), perhaps shown in (E), make plate (403e) to the direction that the flows down direction bending in wave shape that is approximately perpendicular to fluid (F).
Next, with reference to Fig. 1,2,13～15, the structure of the valve body (3) of present embodiment is described in detail.The valve body of present embodiment (3) is that integral body is the tabular eccentric-butterfly-valve of approximate circle, outer peripheral portion on the surface of valve body (3) upstream side has the valve body and valve seat (302) that falls to being arranged in to be formed on the inner valve seat (205) of valve body (2), surface in the downstream side of valve body (3) is that the back side is formed with valve body shaft sleeve part (301), can insert valve rod (5) in this valve body shaft sleeve part (301), make valve rod (5) become the running shaft of this valve body (3), and be used for valve body (3) axle is supported on valve body (3) can be rotated.
Valve seat (205) is arranged on the position with respect to the flow direction off-centre of the valve shaft mind-set fluid (F) of valve rod (5), and is identical therewith, and valve body and valve seat (302) also is positioned on the position with respect to valve shaft center off-centre, falls to being arranged in valve seat (205) when full cut-off.The valve shaft center forms the dual eccentric type that flows down the downstream side off-centre in the direction to the direction that flows down direction perpendicular to fluid (F) and fluid (F).
Valve rod (5) axle that valve body (3) is inserted in the inside of valve body (2) in the valve body shaft sleeve part (301) supports, and can be with respect to valve body (2) rotation, by with inner valve seat (205) butt of this valve body (2) or separate and can open and close.The valve body shaft sleeve part (301) that is formed on valve body (3) back side has upper body shaft sleeve part (301a) and lower body shaft sleeve part (301b), upper and lower respectively valve body (3) back side that is formed on of described upper body shaft sleeve part (301a) and lower body shaft sleeve part (301b), to extension, and be the approximate cylinder shape at valve shaft.
Valve rod (5) has long top valve rod (501) and the relatively shorter bottom valve rod (502) that the round bar by elongated rod shape is whittled into.Insert in the upper body shaft sleeve part (301a) that is formed on valve body (3) back side underpart of top valve rod (501), and utilize and fixingly with pin (305) top valve rod (501) to be fixed on the valve body (3), top valve rod (501) and valve body (3) are become one.Top valve rod (501) inserts from its underpart to central part the top valve rod shaft supporting part (213) that is formed on the valve body (2), and utilizes Sealing (214) sealing near the upper end of top valve rod shaft supporting part (213).Insert in the lower body shaft sleeve part (301b) that is formed on valve body (3) back side upper end portion of bottom valve rod (502), and utilize and fixingly bottom valve rod (502) to be fixed on the valve body (3), thereby bottom valve rod (502) and valve body (3) are become one with pin (306).Bottom valve rod (502) portion to underpart from it inserts in the bottom valve rod shaft supporting part (215) that is formed on the valve body (2), utilize bottom lid (217) to seal from the lower end of bottom valve rod shaft supporting part (215) by bearing spacer (216), and sealed lower portion stem shaft supporting portion (215).
As shown in figure 27, it is the flow direction of fluid (F) that valve body and valve seat (2302) in the existing general dual eccentric-butterfly-valve (2001) is configured to perpendicular to the pipe arrangement direction, in the moment of valve body (2003) being opened a little from full-shut position, fluid (F) flows out quickly.Thereby, exist under the low aperture situation, be difficult to carry out the problem of refined control.
To this, in the valve body (3) of present embodiment, as shown in figure 13, the back side of valve body (3) is that the center has the sealing surface that connects with respect to valve seat (205) and valve body and valve seat (302) inclination to 5 °～20 ° of clockwise directions with the valve shaft, like this, under the situation of low aperture, the uneven torque step-down during full cut-off, and realized that the reduction valve cuts out torque.And, edge part (309) periphery of the nozzle side in the surface of valve body (3) upstream side is formed with upstream, and side compares the upstream nozzle side lug boss (310) that raises into the mound shape significantly, and the wall thickness of the throttle orifice side of valve body (3) is increased, and the edge part of throttle orifice side (311) outwards protrudes diametrically than the edge part (309) of nozzle side.Thus, even under the situation that valve body (3) is opened with little aperture, also can make the inner gap of valve body (3) and valve body (2) keep for a short time, fluid (F) flow that flows out be limited, thereby realize valve body (3) also can carry out meticulous control from little aperture equal percentage characteristics.
Usually in control valve,,, controlled good more so the valve torque of middle aperture is more little because control in the middle aperture of valve.In the valve body (3) of present embodiment, because of the dynamic flow muscle power that roughly acts on equably to high aperture zone on the valve body from low aperture roughly disappears bearing torque (bearing torque), and the torque that fluid (F) is produced is suppressed for low-level, the valve torque can be suppressed be about 1/5th to maximum thus, thereby improved controlled in the middle aperture zone significantly.
The valve body (3) of the dual eccentric type of the embodiment equal percentage characteristics of top such present embodiment that constitutes and the valve body (3003) of existing centre type butterfly valve (3001) are made the inside that model is provided in valve body (2) respectively, and, these valves are opened identical aperture, the fluid (F) that makes appropriate amount with suitable flow velocity and pressure from the paper left side valve body (2) inside by separately to the right, analyze the pressure distribution of this moment.These results are illustrated in Figure 16 and 17.
Figure 16 shows the result of the pressure distribution of the valve body (3) of analyzing present embodiment, and Figure 17 shows the result of the pressure distribution of analyzing the valve body (3003) in the existing centre type butterfly valve (3001).From these comparison, learn, there is very strong negative pressure region in the back side at the valve body (3003) of existing centre type butterfly valve (3001), and in the valve body (3) of present embodiment, the back side at valve body (3) does not almost have negative pressure region, only produce weak negative pressure region respectively in the part of the nozzle side on valve body (3) upstream side surface and edge part (311) periphery of valve body (3) throttle orifice side, because the negative pressure region production of cavitation erosion in fluid (F) is given birth to, growth, so the generation that can suppress to cavitate in the valve body (3) of present embodiment.In addition, the degree that the dense more part of fluid color is depressurized in Figure 17 and 18 is big more.
The cavitation erosion of the valve body (3) of the dual eccentric type of above-mentioned such embodiment equal percentage characteristics that constitutes and above-mentioned explanation is prevented that the high differential pressure control valve (1) that cavitates that can prevent of body (4) present embodiment that combine, shown in Fig. 1,4～6 from making model, use fluid analysis to simulate.Its result is illustrated among Figure 18.Information clear and definite from Figure 18 is learnt, the result of the fluid analysis of the high differential pressure control valve (1) that can the preventing of present embodiment cavitated, the cavitate synergistic effect (synergistic effect) of effect of negative pressure region minimum, preventing of showing that cavitation erosion that the valve body (3) by the dual eccentric type that embodies equal percentage characteristics produces suppresses that effect and cavitation erosion by the back to back position, downstream of the valve body that is provided in dual eccentric type (3) prevent that body (4) from producing.
So, situation at the valve body (3) of the dual eccentric type of the embodiment equal percentage characteristics of the butterfly type control valve of the butterfly valve that uses separately existing type, existing type, present embodiment, prevent under the situation of body (4) combination with cavitation erosion with valve body (3) the dual eccentric type of the embodiment equal percentage characteristics of present embodiment, when valve opening is fixed as 70 °, measure noise properties respectively with respect to the pressure reduction from the low differential pressure to the High Pressure Difference, confirm prevent to cavitate effect and reduction noise result of the present invention, its result is gathered in the plotted curve shown in Figure 19.
Information clear and definite from Figure 19 learns, even in the situation of the valve body (3) of the dual eccentric type of the embodiment equal percentage characteristics of using present embodiment separately, it is remarkable also to reduce noise result than the valve of existing type.That is to say, the valve body of the dual eccentric type of this embodiment equal percentage characteristics (3) can also prevent cavitation erosion carrying out flow control from low aperture accurately under the large-scale valve opening of high aperture under the large-scale pressure reduction from the low differential pressure to the High Pressure Difference.And the valve body (3) by using present embodiment in the lump and the cavitation erosion of present embodiment prevent body (4), also embody the effect and reduce noise result of better preventing to cavitate.
In addition, the measured value with respect to the Cv value % of valve opening % of embodiment's 1 shown in Figure 23 valve body (3).Learn that from its result the valve body of present embodiment (3) embodies equal percentage characteristics approx, the valve body (3) that can say present embodiment thus is the dual eccentric type that embodies equal percentage characteristics.More than, be that example is illustrated as the valve body (3) of present embodiment with the valve body (3) of the dual eccentric type that embodies equal percentage characteristics, but valve body of the present invention is not limited thereto.Other embodiment about valve body is shown below.
Second embodiment
With reference to the accompanying drawings, the embodiment of the valve body that is provided in valve body inside (1003) of the high differential pressure control valve that cavitates that can prevent of the present invention is described in detail.In addition, to the structure general description identical with embodiment 1.
With reference to Figure 20～22, the outer peripheral portion of the valve body of the alternate manner in the present embodiment (1003) on the upstream side surface has the valve body and valve seat (1302) of the valve seat that is used for falling to being positioned to be formed on valve body inside.On the surface in valve body (1003) downstream side is that the back side is formed with valve body shaft sleeve part (1301), in this valve body shaft sleeve part (1301), can insert valve rod (1005), this valve rod (1005) becomes the running shaft of this valve body (1003), and make this valve body (1003) axle be supported on the valve body and can rotate, it is tabular that valve body (1003) integral body is approximate circle.This valve body (1003) is dual eccentric-butterfly-valve, valve shaft is centered close to the dual eccentric position that flows down the downstream side off-centre of direction to the direction that flows down direction perpendicular to fluid (F) and fluid (F), valve seat is arranged in the position with respect to the flow direction off-centre of the valve shaft mind-set fluid of valve rod (1005), identical therewith, valve body and valve seat (1302) also is positioned at the position with respect to valve shaft center off-centre, and falls to being arranged in valve seat when full cut-off.
Valve rod (1005) axle that valve body (1003) is inserted in the inside of valve body in the valve body shaft sleeve part (1301) supports, and can rotate with respect to valve body, by with the valve seat butt of valve body inside or separate and can the inside of valve body be opened and closed.The valve body shaft sleeve part (1301) that is formed on valve body (1003) back side has upper body shaft sleeve part (1301a) and lower body shaft sleeve part (1301b), upper and lower respectively valve body (1003) back side that is formed on of described upper body shaft sleeve part (1301a) and lower body shaft sleeve part (1301b), to extension, and be the approximate cylinder shape at valve shaft.
The back side of valve body (1003) is that the center has with respect to the sealing surface of valve seat and valve body and valve seat (1302) the butt inclination to 5 °～20 ° of clockwise directions with the valve shaft, like this, under the situation of low aperture, the uneven torque step-down during full cut-off, and realized that the reduction valve cuts out torque.And edge part (1309) periphery of the nozzle side in the surface of valve body (1003) upstream side and edge part (1311) periphery of throttle orifice side are formed with upstream the upstream nozzle side lug boss (1310) and the upstream throttle orifice side lug boss (1312) of side projection Chengqiu shape.The size of the projection of upstream nozzle side lug boss (1310) is set smallerly, and the projection of upstream throttle orifice side lug boss (1312) is set highly.In addition, have at edge part (1313) periphery of the throttle orifice side of the face in valve body (1003) downstream side and to form the downstream throttle orifice side lug boss (1314) of side projection Chengqiu shape downstream, compare edge part (1313) the heavy wall shape ground protrusion of throttle orifice side with the edge part (1315) of nozzle side.Thus, can change the Flow characteristics under low, the middle aperture of control, even valve body (1003) is under situation about opening with little aperture, gap between valve body (1003) and valve body inside can keep for a short time, flow to the fluid (F) that flows out limits, and can realize also can carrying out from little aperture the Cv linear percentage characteristic of meticulous control.
The measured value with respect to the Cv value % of valve opening % of the valve body (1003) of the dual eccentric type of second embodiment's who constitutes like that above figure 24 illustrates embodiment Cv linear percentage characteristic.The valve body that can draw present embodiment from its result embodies approx and has Cv linear percentage characteristic.
In addition, do not prevent with cavitation erosion that body is provided with and use the valve body (1003) of the dual eccentric type that embodies Cv linear percentage characteristic separately, in being 20 ° to 90 ° scope, valve opening measures pressure reduction and torque, to be that torque/pressure reduction coefficient turns into and is the value with respect to valve opening with respect to the torque of pressure reduction, be illustrated in the plotted curve shown in Figure 25, and the size of the moment coefficient of the size of moment coefficient and existing valve shown in Figure 26 is compared.Can learn that from Figure 25 because opening process almost is same curve with closing closed procedure, so in the valve body (1003) of the dual eccentric type that embodies Cv linear percentage characteristic, the bearing torque is almost eliminated, and the torque that is caused by fluid (F) is little.Relative with it, the opening process of the existing valve among Figure 26 is different mutually with the curve that closes closed procedure.Valve body (1003) moment coefficient of dual eccentric type that can confirm to embody Cv linear percentage characteristic from these results is little and controlled good.
Description of drawings
Fig. 1 is the sectional view of the structure of the high differential pressure control valve that cavitates of being provided with together of the expression present embodiment valve body that embodies the dual eccentric type of equal percentage characteristics and cavitation erosion can preventing of preventing that body from forming.
Fig. 2 is the same longitudinal section that can prevent the high differential pressure control valve that cavitates.
Fig. 3 is the same rear view that can prevent the high differential pressure control valve that cavitates.
Fig. 4 is the plan view that the cavitation erosion of present embodiment prevents body.
(A) of Fig. 5 is that slave plate face direction is observed the figure that this cavitation erosion of formation prevents the porous slab of body, and (B) of Fig. 5 is the figure that observes this porous slab from the end face direction.
Fig. 6 is the figure of the stepped construction of this porous slab of expression.
Fig. 7 is expression prevents the structure of body as the cavitation erosion of fluid analysis model a three-dimensional longitudinal section.
Fig. 8 is expression prevents the structure of body as the cavitation erosion of fluid analysis model a sectional elevation.
Fig. 9 represents that the cavitation erosion as the fluid analysis model prevents the fluid analysis result's of body the pressure-plotting of fluid.
Figure 10 is the figure of the situation of the eddy current that takes place on the surface that is shown schematically in porous slab, the back side.
(A) of Figure 11 represents that the cavitation erosion that is made of imperforate plate suppresses the figure of the analog result of body, and the cavitation erosion that (B) expression of Figure 11 is made of the porous slab that is formed with a plurality of holes prevents the figure of the analog result of body.
(A)～(F) of Figure 12 is the sectional view of main structure of the variation of expression porous slab.
Figure 13 is the plan view of structure of valve body of dual eccentric type of the embodiment equal percentage characteristics of expression present embodiment.
Figure 14 is the rear view of structure of valve body of the dual eccentric type of same embodiment equal percentage characteristics.
Figure 15 is the longitudinal section of structure of valve body of the dual eccentric type of same embodiment equal percentage characteristics.
Figure 16 result's that to be expression analyze the pressure distribution of the valve body of the dual eccentric type of same embodiment equal percentage characteristics figure.
Figure 17 result's that to be expression analyze the pressure distribution of the valve body of existing centre type butterfly valve figure.
Figure 18 result's that to be expression analyze the pressure distribution that can prevent the high differential pressure control valve that cavitates that the valve body of the dual eccentric type of the embodiment equal percentage characteristics of present embodiment and cavitation erosion is prevented present embodiment that body combines figure.
Figure 19 is that expression is measured the noise properties of each valve and the result's that draws plotted curve.
Figure 20 is the plan view of structure of valve body of dual eccentric type of the embodiment Cv linear percentage characteristic of expression present embodiment.
Figure 21 is the rear view of structure of valve body of the dual eccentric type of the same embodiment of expression Cv linear percentage characteristic.
Figure 22 is the longitudinal section of structure of valve body of the dual eccentric type of the same embodiment of expression Cv linear percentage characteristic.
Figure 23 is the plotted curve with respect to the Cv% value of valve opening % of valve body of dual eccentric type of the embodiment equal percentage characteristics of expression present embodiment.
Figure 24 is the plotted curve with respect to the Cv% value of valve opening % of valve body of dual eccentric type of the embodiment Cv linear percentage characteristic of expression present embodiment.
Figure 25 is the plotted curve with respect to the coefficient value of torque/pressure reduction of valve opening % of valve body of dual eccentric type of the embodiment Cv linear percentage characteristic of expression present embodiment.
Figure 26 is the plotted curve with respect to the coefficient value of torque/pressure reduction of valve opening % of the existing valve of expression.
Figure 27 is the figure of the structure of the existing dual eccentric-butterfly-valve generally of expression.
The explanation of reference character
1 can prevent the high differential pressure control valve that cavitates
2 valve bodies
201 pipe arrangement flanges
202 pipe arrangement flanges
203 seal rings
204 streams
205 valve seats
206 seal ring fixed bodies
207 stem shaft supporting portions
208 install board
209 screw holes
210 cavitation erosions prevent the body installing space
211 counter-rotatings prevent portion
212 fixing screws
213 top valve rod shaft supporting parts
214 Sealings
215 bottom valve rod shaft supporting parts
216 bearing spacers
217 bottom lids
3 valve bodies
301 valve body shaft sleeve part
301a upper body shaft sleeve part
301b lower body shaft sleeve part
302 valve body and valve seats
303 drum portions
304 drum portions
305 fixedly use pin
306 fixedly use pin
The edge part of 309 nozzle side
310 upstream nozzle side lug bosses
The edge part of 311 throttle orifice sides
4 cavitation erosions prevent body
40 cavitation erosions prevent body
41 cylindrical shape frameworks
42 porous slabs
43 holes
The 44a level board
The 44b level board
The 44c level board
45 plates
46 cavitation erosions suppress body
401 cylindrical shape frameworks
402 porous slabs
The 402a plate
The 402b plate
The 402c plate
403 holes
The 403a circular hole
The 403b circular hole
The 403c hole
The 403d hole
The 403e hole
The 403f hole
5 valve rods
501 top valve rods
502 bottom valve rods
1003 valve bodies
1301 valve body shaft sleeve part
1301a upper body shaft sleeve part
1301b lower body shaft sleeve part
1302 valve body and valve seats
1303 drum portions
1304 drum portions
The edge part of 1309 nozzle side
1310 upstream nozzle side lug bosses
The edge part of 1311 throttle orifice sides
1312 upstream throttle orifice side lug bosses
The edge part of 1313 throttle orifice sides
1314 downstream throttle orifice side lug bosses
The edge part of 1315 nozzle side
1005 valve rods
2001 existing dual eccentric-butterfly-valves
2302 valve body and valve seats
3001 existing centre type butterfly valves
3003 valve bodies
The F fluid
Claims (12)
1. high differential pressure control valve that can prevent to cavitate, have on the path that is provided in the pipe arrangement that makes fluid flow the valve body that being approximate tubular and at the valve body of the inside of this valve body can the mode that this inside opens and closes being disposed, it is characterized in that,
Back to back position, downstream under the full-gear of this valve body is equipped with and is used to prevent that the cavitation erosion of cavitating from preventing body, this cavitation erosion prevents that body is provided in the back to back position, downstream of described valve body, and, prevent that in this cavitation erosion a plurality of porous slab equal intervals ground of body is formed with the hole of a plurality of prescribed depth, there is proper spacing mutually in described a plurality of porous slab, and be roughly parallel to the flow direction of the fluid that in this valve body, flows down, when described fluid passes through between described porous slab, be formed on and flow down the eddy resistance that each hole on the vertical direction of direction becomes this fluid with described fluid on each porous slab, the kinetic energy of this eddy current is converted to heat energy, this fluid steadily and is equably reduced pressure, thereby can prevent to take place in low differential pressure to High Pressure Difference therapeutic method to keep the adverse qi flowing downward erosion.
2. the high differential pressure control valve that cavitates of can preventing as claimed in claim 1 is characterized in that,
When the nominal diameter with pipe arrangement was made as D, cavitation erosion prevented that body from setting position into the downstream of being positioned at of, this valve body under the valve body full-gear and preventing that to this cavitation erosion the interval of upstream-side-end of body is in 1D.
3. the high differential pressure control valve that cavitates of can preventing as claimed in claim 1 or 2 is characterized in that,
When the aperture that will be arranged on each hole on the porous slab is made as d, be arranged on a spacing to each other of the hole on the porous slab below the above 4d of 1.5d.
4. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～3, it is characterized in that,
When the aperture that will be arranged on each hole on the porous slab was made as d, porous slab flowed down length on the direction below the above 100d of 20d fluid.
5. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～4, it is characterized in that,
When the aperture that will be arranged on each hole on the porous slab was made as d, to each other each of porous slab was at interval below the above 3d of 1d.
6. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～5, it is characterized in that,
Make the more than one hole in a plurality of holes on the more than one porous slab that is formed in a plurality of porous slabs, form separately with the concavity of prescribed depth from the recessed suitable shape of the plate face on the surface of this porous slab and two sides, the back side.
7. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～6, it is characterized in that,
Be formed on the more than one hole in a plurality of holes on the more than one porous slab in a plurality of porous slabs, form the surface and the back side that connect this porous slab.
8. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～7, it is characterized in that,
Make more than one porous slab in a plurality of porous slabs have curved part more than a place of the direction bending of approximate vertical.
9. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～8, it is characterized in that,
Valve with valve body and valve body constitutes, and can releasably set cavitation erosion in back to back position, the downstream of this valve body and prevent body.
10. as each described high differential pressure control valve of cavitating of can preventing in the claim 1～9, it is characterized in that,
Valve has the valve body of approximate tubular, valve body and valve shaft, described valve body portion within it has valve seat, described valve body can be supported on the inside of this valve body rotatably by axle, by with this inner valve seat butt or separate and can the inside of this valve body be opened and closed, described valve shaft is the running shaft of this valve body, can be supported on this valve body by axle rotatably, described valve body is an eccentric-butterfly-valve, the valve body shaft sleeve part that is used to insert described valve shaft with the downstream side that is formed on this valve body, described valve seat is arranged on the position with respect to the flow direction off-centre of valve shaft mind-set fluid, identical with it, valve body and valve seat also is positioned on the position with respect to valve shaft center off-centre, and when full cut-off, fall to being arranged in described valve seat, being centered close to of valve shaft to flowing down the vertical direction of direction with fluid and fluid flows down on the dual eccentric position of the downstream side off-centre on the direction.
11. the high differential pressure control valve that cavitates of can preventing as claimed in claim 10 is characterized in that,
The edge part periphery of the nozzle side of valve body on the face of this valve body upstream side and the edge part periphery of throttle orifice side are formed with upstream the upstream nozzle side lug boss and the upstream throttle orifice side lug boss of side projection Chengqiu shape respectively, and, the face in this valve body downstream side is that the center has with respect to the sealing surface of valve seat and the valve body and valve seat butt inclination to 5 °～20 ° of clockwise directions with the valve shaft, and has the downstream throttle orifice side lug boss that forms in the mode of side projection Chengqiu shape downstream at the edge part periphery of the throttle orifice side of the face in downstream side.
12. the high differential pressure control valve that cavitates of can preventing as claimed in claim 10 is characterized in that,
The edge part periphery of the nozzle side of valve body on the face of this valve body upstream side is formed with upstream, and side compares the upstream nozzle side lug boss that raises into the mound shape significantly, and, the face in this valve body downstream side is that the center has with respect to the sealing surface of valve seat and the valve body and valve seat butt inclination to 5 °～20 ° of clockwise directions with the valve shaft, and the edge part of the throttle orifice side of this valve body outwards protrudes diametrically than the edge part of nozzle side.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2007/065096 WO2009016756A1 (en) | 2007-08-01 | 2007-08-01 | Cavitation preventive high differential pressure control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101663526A true CN101663526A (en) | 2010-03-03 |
| CN101663526B CN101663526B (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800524876A Active CN101663526B (en) | 2007-08-01 | 2007-08-01 | Cavitation preventive high differential pressure control valve |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4233110B1 (en) |
| CN (1) | CN101663526B (en) |
| WO (1) | WO2009016756A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104169623A (en) * | 2012-03-28 | 2014-11-26 | 法雷奥电机控制系统公司 | Fluid circulation valve |
| CN105954015A (en) * | 2016-04-22 | 2016-09-21 | 浙江优机机械科技有限公司 | Intelligent control valve detection system and valve detection method |
| CN110156110A (en) * | 2018-02-13 | 2019-08-23 | 三浦工业株式会社 | Water treatment facilities |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120217426A1 (en) * | 2011-02-24 | 2012-08-30 | Andrew James Berthelsen | Valve apparatus having a double-offset shaft connection |
| US10094349B2 (en) | 2014-05-08 | 2018-10-09 | Hitachi, Ltd. | Fluid valve assembly |
| US11982164B2 (en) | 2022-08-29 | 2024-05-14 | Saudi Arabian Oil Company | Artificial lift systems using cavitation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60164073A (en) * | 1984-02-01 | 1985-08-27 | Tomoe Gijutsu Kenkyusho:Kk | Butterfly valve |
| JPH022121Y2 (en) * | 1984-12-17 | 1990-01-18 | ||
| JPS62261790A (en) * | 1986-05-08 | 1987-11-13 | Nippon Kokan Kk <Nkk> | Pulsation preventing device for valve |
| JPH0451306Y2 (en) * | 1987-12-03 | 1992-12-03 | ||
| CN2141005Y (en) * | 1992-11-05 | 1993-08-25 | 明赐东 | High-pressure regulating valve |
| JPH08193687A (en) * | 1995-01-17 | 1996-07-30 | Kubota Corp | Noise preventing structure of fluid control valve |
| US20040183046A1 (en) * | 2003-03-19 | 2004-09-23 | Bickell Anthony J. | Anti-scaling control element for a rotary control valve |
| CN2714902Y (en) * | 2004-08-24 | 2005-08-03 | 天津市圣恺工业技术发展有限公司 | Anti-scour cavitation resistant and high pressure difference regulating valve |
-
2007
- 2007-08-01 JP JP2008525736A patent/JP4233110B1/en active Active
- 2007-08-01 CN CN2007800524876A patent/CN101663526B/en active Active
- 2007-08-01 WO PCT/JP2007/065096 patent/WO2009016756A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104169623A (en) * | 2012-03-28 | 2014-11-26 | 法雷奥电机控制系统公司 | Fluid circulation valve |
| CN105954015A (en) * | 2016-04-22 | 2016-09-21 | 浙江优机机械科技有限公司 | Intelligent control valve detection system and valve detection method |
| CN110156110A (en) * | 2018-02-13 | 2019-08-23 | 三浦工业株式会社 | Water treatment facilities |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101663526B (en) | 2012-08-22 |
| WO2009016756A1 (en) | 2009-02-05 |
| JPWO2009016756A1 (en) | 2010-10-14 |
| JP4233110B1 (en) | 2009-03-04 |
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